JPH08298679A - Telephone system - Google Patents

Abstract

PURPOSE: To make it possible to connect a line through a home terminal even when a channel 15 used by a general terminal in a telephone system connected to a public line network and wirelessly connected to a home terminal and a general terminal to be slaves of the telephone system. CONSTITUTION: When all communication channels of a home base station A are being used and a general terminal (a) permitted at its hand-over is used at the time of outputting a link channel establishment request from a home terminal, a hand-over request is sent to the terminal (a) (S2). The terminal (a) receiving the hand-over request outputs a link channel establishment request to a public base station B and executes hand-over to the station B, so that the home terminal can use a communication channel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone device, and more particularly to a home telephone base station that functions as a base unit for a home cordless telephone and also as a public base station for general terminals. is there.

[0002]

2. Description of the Related Art A second-generation cordless telephone system (personal handy phone system: PHS) is used as a mobile telephone system that can make a call using a single mobile telephone in all situations of home, office, and outdoors. Practical application is in progress. In this PHS communication system, a telephone provided in the home has not only a function as a base unit of a conventional home cordless telephone but also a function that enables line connection from a general mobile telephone. Home telephone base stations are known.

Further, in Japanese Patent Laid-Open No. 4-170825, a radio station incorporated in a fixed station is time-divided into a plurality of channels, and at least one of the time slots is made available to a public portable radio station so that a general household By installing this fixed station, not only as a base unit of a home cordless telephone but also as a fixed station of a public portable radio device. Further, with regard to handover for assigning a wireless communication channel, in the past, Japanese Patent Laid-Open No. 4-18 has been proposed.
As disclosed in Japanese Patent Laid-Open No. 5026, the one in which the handover criterion is changed according to the line usage rate,
As shown in Japanese Patent No. 64477, an example is known in which the handover criterion is changed based on the call channel usage rate of the handoff source and the call channel usage rate of the handoff destination.

[0004]

However, a home telephone base station has a limited number of communication channels, and if all the channels are used by general terminals, the home telephone base station is a child of the home telephone base station. Even if a person who has a portable terminal (home terminal) as a machine returns to the home and enters the wireless zone of the home telephone base station, the home terminal is used to operate the home telephone base station. Cannot make a call through. Therefore, it is an object of the present invention to provide a telephone device such as a home base station that can be connected to a line by a home terminal even when a call channel is blocked by a general terminal.

[0005]

The present invention was created to solve the above problems. First, a telephone device connected to a public line network, A handover request is made to a general terminal that is wirelessly connected to a slave unit and wirelessly connected to a general terminal used for public use, and that is a general terminal that uses the telephone line of the telephone apparatus. Characterize. Secondly, when all the telephone lines of the telephone device are in use and at least one general terminal is in use, and there is a call request from the child device of the telephone device, one of A feature is that a handover request is issued to the terminal.

Thirdly, a telephone device connected to a public line network, which is wirelessly connected to a child device of the telephone device and is also wirelessly connected to a general terminal used for public use. I store the ID of the child device of the telephone device I
A D storage unit, a slot information storage unit that stores, for each slot, information indicating whether or not the slot is in use, and information regarding whether or not the general terminal is using the slot;
According to the information stored in the storage unit and the slot information storage unit,
And a handover request unit for requesting handover to a general terminal. Also, the fourth
Is characterized in that the slot information storage section further stores information as to whether or not handover is permitted for the terminal being used. Fifthly, the slot information storage section further stores a reception level for each slot. Also, the sixth
Is characterized in that when there are a plurality of general terminals that are permitted to perform handover among the general terminals that are using the slot, the general terminal having a lower reception level preferentially requests the handover.

[0007]

In the telephone device of the first configuration according to the present invention, when the telephone line of the telephone device is used by the general terminal, for example, the handset in the wireless zone of the telephone device makes a call request. When this is done, a handover request is issued to this general terminal. Then, the general terminal that has received the handover request performs a handover to another base station, for example, a public base station, and performs line connection via the other base station. As a result, the call line of the telephone device can be used, and the other terminals such as the child device are allowed to make a call using this call line. According to the telephone device of the present invention, the telephone line of the telephone device can be used even if the telephone line is blocked by the use of the general terminal. In the telephone device of the second configuration, when all the telephone lines of the telephone device are in use and at least one general terminal uses the telephone line, a call request is issued from the child device of the telephone device. If there is, a handover request is made to the general terminal. Thereby, the telephone line can be preferentially used by the child device of the telephone device.

Further, in the telephone device of the third structure, when a call request is made from a terminal such as a home terminal, I
Based on the information in the D storage unit, it is determined whether or not the terminal that issued the call request is a slave unit of the telephone device. If it is a slave unit of the telephone device, it issues a handover request to the terminal according to the information in the slot information storage unit. That is, it is determined whether all slots are in use, and whether or not a general terminal is using them. For example, when all slots are in use and the general terminal is using the slot, Requests handover to the general terminal.
By handing over the general terminal requested to be handed over to another base station such as a public base station, the telephone line of the telephone device can be used by the child device of the telephone device.

[0009] In particular, as in the telephone device of the above-mentioned fourth configuration, when information indicating whether or not handover is permitted is stored in the slot information storage unit in the slot information storage unit. Performs a handover to a terminal for which a handover is permitted, and thus does not make an unnecessary handover request. Further, particularly when the reception level for each slot is stored in the slot information storage section as in the telephone device of the fifth configuration, for example, the handover is performed as in the sixth configuration. When there are a plurality of general terminals permitted to perform the handover, a handover request is issued from the general terminal with a low reception level. Therefore, by preferentially handing over the general terminal having a low reception level, the transmission quality between the telephone device and the general terminal can be maintained.

[0010]

Embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the home base station A according to the present embodiment has a line controller 10, a radio controller 12, a signal transmitter 14, a signal receiver 16, an antenna 18, and a central controller. 20 and a storage unit 22.

The line control unit 10 is connected to a public line network and controls analog lines and digital lines. In addition, the wireless control unit 12 uses the signal transmission unit 1
4 is for performing wireless communication via the signal receiving unit 16 and the antenna 18, and is for generating a home control carrier and a public control carrier. The central control unit 20 controls the operation of each unit of the home base station A. Here, when there is a call request from the home terminal, the central control unit 20 generates a handover request signal when all slots are used by general terminals, and the radio control unit 12 and the signal transmission are performed. Unit 14, signal receiving unit 1
6. It has a function of outputting the handover request signal via the antenna 18. That is, the central control unit 2
0 also functions as a handover request unit.

Further, the storage unit 22 stores various data. For example, I as shown in FIG.
A D table and a slot table as shown in FIG. 4B are provided. Here, as shown in FIG. 4A, the ID table stores the ID number of each home terminal as a child device of the home base station A, and the slot table contains the ID numbers shown in FIG. As shown in (b), various information about each slot is stored. That is, data on whether a certain slot is in use or not, whether the terminal using the slot is home or public, that is, whether it is a home terminal or a general terminal. Data, whether or not handover is permitted in the terminal using the slot, and reception level data with the terminal using the slot are stored.

Next, the usage state of the home base station A having the above configuration will be described. First, as shown in FIG. 2A, a home base station A is installed in a home, and general terminals a to c are in a call state via the home base station A, and a call from the home base station A is made. All lines are in use. In other words, it is assumed that all slots as call channels are in use. Then, it is assumed that the person who holds the home terminal as a child device of the home base station A returns home and enters the wireless zone of the home base station A. Then, it is assumed that a calling operation is performed using this home terminal.

Then, as shown in FIG. 3, the home terminal issues a link channel establishment request to the home base station A (S1). Then, the home base station A stores in the storage unit 22 whether or not the terminal that has requested the link channel is the home terminal.
It is determined by the ID table provided in If the terminal making the call request is a home terminal, whether all slots are in use, and if all slots are in use, the general terminal selects all slots. The storage unit 2 determines whether or not the general terminal uses all slots and whether or not handover is permitted in the general terminal when the general terminal uses all slots.
It is determined by the slot table of No. 2.

If all slots are being used by the general terminal and the terminal in use has a general terminal for which handover is permitted, a handover request signal is output to that general terminal. To request handover (S2). In addition, when there are a plurality of general terminals for which handover is permitted, the handover request is preferentially made to the general terminal having a low reception level.
In this way, it is possible to prevent useless handover by making a handover request to a general terminal to which handover is permitted, and to give a handover request to a general terminal with a low reception level with priority. As a result, the transmission quality between the home base station A and the general terminal can be maintained as much as possible. In this embodiment, it is assumed that a handover request is made to the general terminal a in FIG.

In response to the request, the general terminal a makes a link channel probability request to the public base station B (S3), and the public base station B sends the request to the general terminal a. Link channel allocation is performed (S4). Then, the call setting is performed from the general terminal a to the public base station B (S5), and the call setting acceptance and the response are performed from the public base station B to the general terminal a according to the call setting (S6, S7), a call state is established between the general terminal a and the public base station B. Further, the home base station A receives the information from the public network and sends a disconnection signal to the general terminal a,
In response to this, the release signal and the release completion signal are exchanged (S8, S9, S10). Then, home base station A
Disconnects the line connection with the general terminal a, and thereafter allocates a link channel to the home terminal (S1
1) After that, call setup from the home terminal, call setup acceptance from the home base station, calling, and response are performed (S12 to S1).
5).

As described above, as shown in FIG. 2B, the general terminal a is handed over so that the home terminal can use the vacant slot, and the home terminal makes a call. To be able to Even if a handover request is made to a general terminal,
If the general terminal is not handed over, another general terminal permitted to be handed over will be requested to hand over. On the other hand, when the home terminal issues a call request, unlike the above case, if there is an empty slot in the communication channel, the slot is assigned to the home terminal and the link channel is assigned to the home terminal.

In the above embodiment, the description is made assuming that the handover request is made when the general terminals are in use for all the slots. However, one of the slots is used by the general terminals permitted to perform the handover. In this case, a handover request may be issued to increase the line use opportunities of the home terminal. Further, in the above embodiment, when the home terminal performs the call operation and the link channel establishment request is made, the handover request is made. However, the present invention is not limited to this. The timing of entering the station's wireless zone,
Alternatively, a handover request may be issued to a general terminal at the timing of entering the wireless zone of the home base station and registering the location.

In FIG. 3, the processing from disconnection (S8) to release completion (S10) is omitted if it can be confirmed that the line connection between the general terminal a and the home base station has been disconnected. Good. In the above embodiment, the home base station has been described, but a telephone device that issues a handover request to a general terminal when there is a call request from a handset, for example, is for a business office. It may be a base station.

[0020]

According to the telephone device of the first aspect of the present invention, since the telephone line of the telephone device can be used by handing over the general terminal to another base station, the telephone device can be used. Other terminals such as a child device can make a call using this call line. According to the telephone device according to the second aspect, when a call request is made from the child device of the telephone device, a handover request is made to the general terminal, so that the child device of the telephone device gives priority to the call. You can use the telephone line. Further, according to the telephone device of the third aspect, the handover request is made to the general terminal according to the information of the ID storage unit and the information of the slot information storage unit, so that the telephone device of the telephone device of the telephone device can perform You can use the telephone line.

In particular, according to the telephone device of the fourth aspect, since the handover is performed to the terminal for which the handover is permitted, the unnecessary handover request is not made. Further, in particular, according to the telephone device according to the fifth or sixth aspect, it is possible to maintain the transmission quality between the telephone device and the terminal by preferentially handing over the terminal having a low reception level.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a home base station according to an embodiment of the present invention.

FIG. 2 is a diagram showing a usage state of a home base station of the present embodiment, (a) is an explanatory diagram showing a state when a call is made from a home terminal, and (b) is a case where handover is completed. It is explanatory drawing which shows the state of.

FIG. 3 is a sequence diagram showing an operation state of the present embodiment.

FIG. 4 is a diagram showing a table stored in a storage unit,
(A) is explanatory drawing which shows an ID table, (b) is explanatory drawing which shows a slot table.

[Explanation of symbols]

 A home base station 10 line control unit 12 wireless control unit 14 signal transmission unit 16 signal reception unit 18 antenna 20 central control unit 22 storage unit

Claims (6)

[Claims] 1. A telephone device connected to a public line network, the telephone device wirelessly connecting to a slave unit of the telephone device and wirelessly connecting to a general terminal used for public use. A telephone device characterized by making a handover request to a general terminal using a communication line of the device. 2. When all the telephone lines of the telephone device are in use, at least one general terminal is using the telephone line, and there is a call request from a child device of the telephone device. The telephone device according to claim 1, wherein the telephone device issues a handover request to a general terminal. 3. A telephone device connected to a public line network, the telephone device wirelessly connecting to a slave unit of the telephone device and wirelessly connecting to a general terminal used for public use. An ID storage unit that stores the ID of the child device of the device, a slot information storage that stores, for each slot, information whether the slot is in use and information that the general terminal is using And a handover request unit for requesting a handover to a general terminal according to the information stored in the ID storage unit and the slot information storage unit. 4. The telephone device according to claim 3, wherein the slot information storage section further stores information as to whether or not handover is permitted for the terminal being used. 5. The telephone device according to claim 3, wherein the slot information storage section further stores a reception level for each slot. 6. A general terminal using a slot, when there are a plurality of general terminals for which handover is permitted,
6. The telephone device according to claim 5, wherein the general terminal having a low reception level preferentially issues the handover request.